diff --git a/tsdb/record/record.go b/tsdb/record/record.go
index 106b8e51bc..8496fbf9d1 100644
--- a/tsdb/record/record.go
+++ b/tsdb/record/record.go
@@ -158,7 +158,7 @@ type RefSeries struct {
 }
 
 // RefSample is a timestamp/value pair associated with a reference to a series.
-// TODO(beorn7): Perhaps make this "polymorphic", including histogram and float-histogram pointers? Then get rid of RefHistogramSample.
+// TODO(beorn7): test Perhaps make this "polymorphic", including histogram and float-histogram pointers? Then get rid of RefHistogramSample.
 type RefSample struct {
 	Ref chunks.HeadSeriesRef
 	T   int64